Houdini 18 - Python Projects - Working with Multiparms

Howdy Guys!
I hope everyone is doing well! I recently needed to export data from an hda that was using Multiparms for its user interface. Multiparms are really cool parameters in HDA's that let you override individual instance geometry with different values. These nifty paramters are very powerful when creating more advanced HDAs.
In this video we are going to learn how to get the data from each instance in a multiparm list and learn how to export it to a JSON file in a clean easy to read way. Next week Ill show ya guys how to then import this data back into an HDA so it can be used as a way to save out presets for your HDAs.
Patreon: / indiepixel
Thanks!

[@philippzakrzewski8180]

Thanks for this. I was going crazy trying to get those expressions to work. I had never even heard of "strcat" before :-D

[@justindykhouse7761]

Very handy, this saved me half of a day's work today. Thank you!

[@spikearo]

Thanks for sharing this, it's very useful to know how to store data from houdini

[@ThiagoLaranjeiraZerooneBit]

❤️ look who's alive

[@AlabhyaSpurs]

Yay! Welcome back!!

[@IndiePixel3D]

Thanks! Got caught up with work stuff...but am back!:)

[@OnkAnCa64]

oh, so cool thanks

[@siposattila_tutorials]

Thank you very much!

[@fxtech-art8242]

cool thanks again

[@kasali2739]

would be great to have a kind of "color picker" to transfer set of multiparms from one entity to another. For this example for each new set to transfer color and position from one object entry Is this possible in Python?

[@nictanghe98]

ugh, i wish i saw someone use strcat 5 months earlier.

[@milad_savar]

Great job - how can active or Deactive display flag node in the Parameters ?

[@IndiePixel3D]

You can set a nodes display flag by using hou.node("node name").setDisplayFlag(True).

[@milad_savar]

@@IndiePixel3D Thanks.

[@fxtech-art8242]

can we add startup scripts just for certain project ? tried adding scripts folder in project and added 456.py in it....but doesnt seems to work It works fine for $HOME but not for per project....

[@IndiePixel3D]

Yep, you can put a script into the hou.session www.sidefx.com/docs/houdini/hom/hou/session.html

[@fxtech-art8242]

@@IndiePixel3D if i define something in hou.session....i have to call it somewhere...is there any way so that it will execute automatically when i open new file..? similar to 456.py

[@IndiePixel3D]

@@fxtech-art8242 sure thing...just call the function you want to execute at the bottom of your script.

[@junzheshen3343]

Hi, again! I have some issues with adding text attributes to the detail. I am using geo.addAttrib(hou.attribType.Global, "test", "asdfasdf"), but the attribute "test" in the detail is blank.

[@IndiePixel3D]

Do a geo.setAttribValue right after the add...does it fill the attr?

[@junzheshen3343]

@@IndiePixel3D It does!! Thx! But that's so weird, you can only directly add numbers but not the text.

[@IndiePixel3D]

@@junzheshen3343 well, I think it wants us to add a string attr first...so its templated... but I hear ya...should just create it with the addAttr function...might be a houdini bug?